following years of denials, lance armstrong admits to using performance enhancing drugs to win the tour de france. >>> executive action. president obama says he may invoke the power of the presidency in an attempt to tighten firearms laws and limit gun violence. >>> and show of strength. a team of new york city police officers free a man trapped beneath a nearly two-ton taxi by lifting the vehicle off the ground. captioning funded by cbs >>> good morning, everybody. good to be with you. i'm terrell brown. following years of denial and lambasting his critics, cyclist lance armstrong has middle to -- has admitted using performance enhancing drugs. cbs news learned that armstrong, the seventime tour de france